Fix operator naming in pg_trgm GUC option descriptions

Descriptions of pg_trgm GUC options have % replaced with %% like it was
a printf-like format.  But that's not needed since they are just plain strings.
This commit fixed that.  Backpatch to last supported version since this error
present from the beginning.

Reported-by: Masahiko Sawada
Discussion: https://postgr.es/m/CAD21AoAgPKODUsu9gqUFiNqEOAqedStxJ-a0sapsJXWWAVp%3Dxg%40mail.gmail.com
Backpatch-through: 9.4

diff --git a/contrib/pg_trgm/trgm_op.c b/contrib/pg_trgm/trgm_op.c
index 9f26725ec21f185db93636abda8093fee055fa2d..589dbb87ad5f152918792dca93f4615242aafafe 100644 (file)
--- a/contrib/pg_trgm/trgm_op.c
+++ b/contrib/pg_trgm/trgm_op.c
@@ -65,7 +65,7 @@ _PG_init(void)
 {
    /* Define custom GUC variables. */
    DefineCustomRealVariable("pg_trgm.similarity_threshold",
-                            "Sets the threshold used by the %% operator.",
+                            "Sets the threshold used by the % operator.",
                             "Valid range is 0.0 .. 1.0.",
                             &similarity_threshold,
                             0.3,
@@ -77,7 +77,7 @@ _PG_init(void)
                             NULL,
                             NULL);
    DefineCustomRealVariable("pg_trgm.word_similarity_threshold",
-                            "Sets the threshold used by the <%% operator.",
+                            "Sets the threshold used by the <% operator.",
                             "Valid range is 0.0 .. 1.0.",
                             &word_similarity_threshold,
                             0.6,
@@ -89,7 +89,7 @@ _PG_init(void)
                             NULL,
                             NULL);
    DefineCustomRealVariable("pg_trgm.strict_word_similarity_threshold",
-                            "Sets the threshold used by the <<%% operator.",
+                            "Sets the threshold used by the <<% operator.",
                             "Valid range is 0.0 .. 1.0.",
                             &strict_word_similarity_threshold,
                             0.5,